Single piece rotary wrenching tool

Abstract

A rotary wrenching tool used on polygonal nuts, bolts and screws is disclosed. More particularly, the wrenching tool is a single piece rotary wrenching tool with a uniform interior having no moving parts and consisting of six or twelve inwardly projecting lobes of the same size that enable the wrench or socket to exert pressure on the flats of hexagonal objects away from the corners. This invention further relates to a duplex wrench operable on hexagonal fasteners measured by the metric, inch, or both systems. Within a defined range in one wrench, each wrench secures hexagonal objects measured by both inch and metric systems.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority to U.S. provisional patent application No. 60 / 797,190 filed May 2, 2006, which is incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]For many years, traditional wrenches have been widely used. Traditional wrenches are frequently found inconvenient, inefficient, cumbersome and new wrenches are highly demanded. For instance, wrenches having closed openings with planar engagement surfaces often result in the stress applied to the hexagonal fastener and thus cause deformation of the fastener and inefficient torquing ability. In order to overcome the problems, prior art wrenches having closed openings with curved engagement surfaces were invented. U.S. Pat. No. 4,930,378 Colvin. Although the prior art wrenches are constructed six-point or twelve-point versions, problems with distributing the stresses are not resolved. Furthermore, the twelve-point version is only on either metric ...

AI Technical Summary

Benefits of technology

"The present invention is a duplex wrench that solves various problems associated with traditional wrenches. The wrench has a tapered internal guide that increases the offset quality of both end and box crowns, which prevents deformation of the fastener and inefficient torquing ability. The wrench is compact and can operate in tighter spaces than most traditional wrenches. It also provides sufficient space for the shaft of a hex bolt to pass through, making dropped and lost nuts less of a problem. The duplex wrench is easy to pick the right one for the job and can be used on both measuring systems. It requires less weight and metal than traditional wrenches and minimizes guesswork on choosing the right size wrench."

Problems solved by technology

This decreases deformation of the fastener and inefficient torquing ability.

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